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String Concatenation

String variables can be connected together to build larger string types via the C# + operator. As you

may know, this technique is formally termed 

string concatenation. Consider the following new

helper function:

static void StringConcatenation()

{

Console.WriteLine("=> String concatenation:");

string s1 = "Programming the ";

string s2 = "PsychoDrill (PTP)";

string s3 = s1 + s2;

Console.WriteLine(s3);

Console.WriteLine();

}

You may be interested to know that the C# + symbol is processed by the compiler to emit a call

to the static String.Concat() method. In fact, if you were to compile the previous code and open

the assembly within ildasm.exe (see Chapter 1), you would find the CIL code shown in Figure 3-10.

Figure 3-10.

The C# + operator results in a call to String.Concat().

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Given this, it is possible to perform string concatenation by calling String.Concat() directly

(although you really have not gained anything by doing so—in fact, you have incurred additional

keystrokes!):

static void StringConcatenation()

{

Console.WriteLine("=> String concatenation:");

string s1 = "Programming the ";

string s2 = "PsychoDrill (PTP)";